So much that the players are losing a startling two kilograms in body weight every warm-weather training session.
And he has followed that up by giving his players exercise drills in saunas.
At St George’s Park last week we were doing double sessions.
“It’s kind of like pre-season and then, at night, we were doing bike sessions in heat chambers to get ready. Basically, you’re in a sauna on a bike. We’ve been doing half-hour sessions in there and it’s brutal, really hard work. No one’s grumbled or moaned about it. We’ve just got on with it.
“When we were in Portugal we wore under-armour, t-shirts, zip up tops and a wet top over that. So it’s a lot of layers. When it was 22 degrees, the lads were losing two kilos in sweat in every training session: it’s all about trying to replicate the heat and humidity out there.
“So we’d be weighed before and after training, so you’d know how much fluid you’ve got to replace.
England are currently in Miami for two friendlies against Ecuador and Honduras.
The first clash against the Ecuadorians kicks off at 3pm today with the temperature forecast to be 28C and humidity 62 per cent.
That’s not far off the temperature (30C) and humidity (72 per cent) in Manaus on Tuesday and should prepare the Three Lions for their big kick-off in 10 days’ time.
Source: The Guardian.